James lamont



No Model.) H

J. LAMONT.

DEVICE FOR MAKING WATCH GASE BACKS.

No. 284,440. P444114 4 Sept. 4, 18843.

'WITNESSES: W

ATTORNEYS.

. UNITED STATES PATENT OF ICE.

JAMES LAMoNnoF SAGHARBOR, ASSIGNOR To FAHYS WATCH CASE i COMPANY, OF NEWYORK, N. Y.

DEVICE FOR MAKING WATCH-CASE BACKS.

SPECIFICATION forming part of Letters Patent No. 284,440, datedSeptember 4, 1883.

Application filed May 7, isss. (No model.

To all whom itmay concern Be it known that I, JAMES LAMoNr, of SagHarbor, in the county of Suffolk and State of New York, have inventedcertain new and useful Improvementsin Devices for Making Watch-CaseBacks, of which the following is a full, clear, and exact description.

This 1nvention consists in a novel construction of dies and combinationsof parts pertaining thereto for making the backs or covers for cases ofwatches and lockets bycompressing and shaping the metal at the edge offrom the snap-fashioned shell without being taken apart, thuseconomizing both time and labor, substantially as hereinafter described.Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figurel represents a plan of the expanding and automatically-contractingdie embodied in and forming part of my invention. Fig. 2 is a verticaltransverse section, upon the line ww in Fig, 1, of said die, with anupper loose ring applied to it, and representing said die as in positionupon a removable bed-plate arranged within a watch-case back before saidback or shell is compressed and shaped at its edgeto form the snap, andFig. 3 is a horizontal section upon the linear or in Fig. 2 of. saiddie. Fig. 4. represents a vertical section, upon the line y y in Fig. 5,of the dies, plungersfand other parts used in compressing and shapingthe edge of the shell or back of a watchcase, and showing said dies andparts as in Opera tion at the completion of the work, and. Fig.

5 is a horizontal section upon theline a z in Fig. 4. I The invention,as regards the construction of the dies and combinations of partspertainconstruction of the back before it is operated upon by'myimproved devices. 'Within this shell or back I place a loose orremovable bedplate, B,'the lower surface of which conforms to theinterior of the bottom of the back A, and the upper surface of which hasor may have concentric circular depressions, as at b c.

O is' the expanding and automatically-contracting die, which is nextplaced upon the bed-plate B within the shell or back A, as shown in Fig.2. This die, which is of any desired thickness, is of segmentalconstruction and collapsible diametrically, and is held contracted byone or more springs, 01, applied to its exterior. It is also constructedwith a downwardly diminishing tapering aperture, 6, in its GBIltGlQfiDdwith an enlarged central projection, f, on the under surface of itsexpanding and contracting segments, which projection fills thedepression I) in the plate B whenthe die is expanded, to restrict theaction of said die to its required expansion. There is also arrangedupon or around a reduced upper portion of the die 0 a loose ring, D,which likewise limits or controlsthe expan= sion of said die.

The die 0, when first introduced, as shown in Fig. 2, is in itscontracted condition by means of the spring or springs d. Said die, withits loose ring D, bed-plate B, and shell or case-back A, is then placedupon a fixed bed, E, of a doubleaction cam or other suit able press.This fixed bed is recessed to receive within it the shell A, to theouter configuration of which, throughout its depth, it conforms. I

Attached to or connected with the operating portionof the press in anysuitable manner is an inner or central conical metalplunger, F,arranged'to operate over and-within the central aperture, e, of the die0; also, an

, outer annular metal plunger, G, arranged to entering the aperture 6 ofthe expanding-die 0 till arrested by a collar, 9, on said plunger,expands and holds the die centrally and keeps it expanded until thepressing of the case-backA is completed. The central aperture, 6, ismade tapering, so that the deeper the plunger F goes in the more willthe die 0 be expanded, and this in an easy and gradual manner. Said diewill be expanded till arrested by the walls of the recess bin the plateB and loose ring D, or either. Thisdetermines the lateral action of thedie 0 upon or against the interior of the edge portion of the shell A togive it the thickened snap form shown at al-in Fig. 4, the bottom of thesegments of the die 0 being constructed peripherically, as shown at h,to protrude and conform to the required interior shape of said edge.This formation and compression of the edge of the shell A, however, isnot effected or completed without the aid of the outer plunger, G,which, after the plungerFhas completed its downstroke and expanded thedie (3, comes down and swages. the metal at the edge of the shell Aaround the outside projection, h, of said die. The inside plunger, F, isnow raised and leaves the expanded die 0 held by the outside plunger,after which the outside plunger, G, rises and allows the collapsible die0 to be contracted by its springs d, and so that it may be removed fromthe shell or back A without coming apart, and be left in a condition foroperation upon a succeeding shell or watch-case back. i

In addition to the function hereinbefore specified for the loose ring D,it may also serve as a guide for the outerplunger, G, and prevent saidplunger from coming in contact with the segments of the expanding andautomatically-contracting die 0. g

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent having a tapering central expanding aperture,

e, and a peripherally-arranged lip or projection, h, of one or moresprings, d, applied to close or contract said body, essentially as andfor the purposes described.

2. The removable plate B, constructed with a recess, 12, on its uppersurface, in combination with the expanding and automaticallycontractingdie 0, constructed with a projection, f, on its bottom, essentially asand for the purpose described.

3. The combination of the loose ring D with the expanding andautomatically-contracting die 0, constructed with a lower periphericalprojection, h, substantially as specified.

4. In apparatus for compressing and shaping the edges of watch-case andother like backs, the combination, with the removable bed-plate B andfixed die or bed E, in which the shell or back to be operated upon isplaced, of the expanding and automatically-contracting spring-bound die0, constructed with a central tapering aperture, 0, the inner conicalplunger, F, and the outer annular plunger, G, for operation in relationwith each other essen tially as described.

5. The combination, with the expanding and automatically-contracting die0 and outer plunger, G, of the loose ring D, constructed and arranged tocontrol the expansion of said die and to act as a guide 'for the outerplunger, substantially as specified.

JAMES LAMONT.

Witnesses:

THos. F. BISGOOD, HARRY Brscoon.

